2978732809 has 32 divisors (see below), whose sum is σ = 3588399360. Its totient is φ = 2442700800.

The previous prime is 2978732797. The next prime is 2978732819. The reversal of 2978732809 is 9082378792.

2978732809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2978732809 - 2⁵ = 2978732777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2978732809.

It is not an unprimeable number, because it can be changed into a prime (2978732819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1304749 + ... + 1307029.

It is an arithmetic number, because the mean of its divisors is an integer number (112137480).

Almost surely, 2^2978732809 is an apocalyptic number.

It is an amenable number.

2978732809 is a deficient number, since it is larger than the sum of its proper divisors (609666551).

2978732809 is a wasteful number, since it uses less digits than its factorization.

2978732809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 2978732809 is about 54577.7684501666. The cubic root of 2978732809 is about 1438.8334187643.

The spelling of 2978732809 in words is "two billion, nine hundred seventy-eight million, seven hundred thirty-two thousand, eight hundred nine".